From the website: "Sri Nisargadatta Maharaj was an Indian spiritual teacher and philosopher of Advaita (Nondualism), and a Guru, belonging to the Navnath Sampradaya. Sri Nisargadatta, with his direct and minimalistic explanation of non-dualism, is considered the most famous teacher of Advaita since Ramana Maharshi. In 1973, the publication of his most famous and widely-translated book, "I AM THAT", an English translation of his talks in Marathi by Maurice Frydman, brought him worldwide recognition and followers."